1 /* 2 * (C) Copyright 2001 3 * Wolfgang Denk, DENX Software Engineering, wd@denx.de. 4 * 5 * SPDX-License-Identifier: GPL-2.0+ 6 */ 7 8 /* 9 * Date & Time support for Philips PCF8563 RTC 10 */ 11 12 /* #define DEBUG */ 13 14 #include <common.h> 15 #include <command.h> 16 #include <rtc.h> 17 #include <i2c.h> 18 19 #if defined(CONFIG_CMD_DATE) 20 21 static uchar rtc_read (uchar reg); 22 static void rtc_write (uchar reg, uchar val); 23 24 /* ------------------------------------------------------------------------- */ 25 26 int rtc_get (struct rtc_time *tmp) 27 { 28 int rel = 0; 29 uchar sec, min, hour, mday, wday, mon_cent, year; 30 31 sec = rtc_read (0x02); 32 min = rtc_read (0x03); 33 hour = rtc_read (0x04); 34 mday = rtc_read (0x05); 35 wday = rtc_read (0x06); 36 mon_cent= rtc_read (0x07); 37 year = rtc_read (0x08); 38 39 debug ( "Get RTC year: %02x mon/cent: %02x mday: %02x wday: %02x " 40 "hr: %02x min: %02x sec: %02x\n", 41 year, mon_cent, mday, wday, 42 hour, min, sec ); 43 debug ( "Alarms: wday: %02x day: %02x hour: %02x min: %02x\n", 44 rtc_read (0x0C), 45 rtc_read (0x0B), 46 rtc_read (0x0A), 47 rtc_read (0x09) ); 48 49 if (sec & 0x80) { 50 puts ("### Warning: RTC Low Voltage - date/time not reliable\n"); 51 rel = -1; 52 } 53 54 tmp->tm_sec = bcd2bin (sec & 0x7F); 55 tmp->tm_min = bcd2bin (min & 0x7F); 56 tmp->tm_hour = bcd2bin (hour & 0x3F); 57 tmp->tm_mday = bcd2bin (mday & 0x3F); 58 tmp->tm_mon = bcd2bin (mon_cent & 0x1F); 59 tmp->tm_year = bcd2bin (year) + ((mon_cent & 0x80) ? 1900 : 2000); 60 tmp->tm_wday = bcd2bin (wday & 0x07); 61 tmp->tm_yday = 0; 62 tmp->tm_isdst= 0; 63 64 debug ( "Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n", 65 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday, 66 tmp->tm_hour, tmp->tm_min, tmp->tm_sec); 67 68 return rel; 69 } 70 71 int rtc_set (struct rtc_time *tmp) 72 { 73 uchar century; 74 75 debug ( "Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n", 76 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday, 77 tmp->tm_hour, tmp->tm_min, tmp->tm_sec); 78 79 rtc_write (0x08, bin2bcd(tmp->tm_year % 100)); 80 81 century = (tmp->tm_year >= 2000) ? 0 : 0x80; 82 rtc_write (0x07, bin2bcd(tmp->tm_mon) | century); 83 84 rtc_write (0x06, bin2bcd(tmp->tm_wday)); 85 rtc_write (0x05, bin2bcd(tmp->tm_mday)); 86 rtc_write (0x04, bin2bcd(tmp->tm_hour)); 87 rtc_write (0x03, bin2bcd(tmp->tm_min )); 88 rtc_write (0x02, bin2bcd(tmp->tm_sec )); 89 90 return 0; 91 } 92 93 void rtc_reset (void) 94 { 95 /* clear all control & status registers */ 96 rtc_write (0x00, 0x00); 97 rtc_write (0x01, 0x00); 98 rtc_write (0x0D, 0x00); 99 100 /* clear Voltage Low bit */ 101 rtc_write (0x02, rtc_read (0x02) & 0x7F); 102 103 /* reset all alarms */ 104 rtc_write (0x09, 0x00); 105 rtc_write (0x0A, 0x00); 106 rtc_write (0x0B, 0x00); 107 rtc_write (0x0C, 0x00); 108 } 109 110 /* ------------------------------------------------------------------------- */ 111 112 static uchar rtc_read (uchar reg) 113 { 114 return (i2c_reg_read (CONFIG_SYS_I2C_RTC_ADDR, reg)); 115 } 116 117 static void rtc_write (uchar reg, uchar val) 118 { 119 i2c_reg_write (CONFIG_SYS_I2C_RTC_ADDR, reg, val); 120 } 121 122 #endif 123